Fire extinguisher



W. W. WALKER FIRE EXTINGUISHER April 16, 1929.

Filed Feb. 18, 1924 seat, where, by evaporation, it is likely to form a deposit causing the stopple to stick closed. It has been explained that creeping isan effect of capillarity, the liquid tending to flow into the minute crevicesbetween the microscopic crystals that have been p duced by previous wetting, thus gradually building up further crystal's and advancing the deposit toward the seat. The process is va slow one and increase in thelength of the creep-path is correspondingly effective to prevent deposit on'the seat. Any exterior configuration of: the inner receptacle, above the liquid level in the outer container, which will thus increase the creep-path, will obviously have a similar effect and will, to that extent, be the equivalent of the means just described and within this invention. -The, reentrant surface formed by the open bottom chamber 8 is believed ,to be, the most convenient means of increasing the distance. By the descr bed;- construction, Vmoreover,

the stopple. seat is, also protected against beingwetted lay-splashing of the outer solution, by yirtue otthe-ledge iorination resul ing from the difi'erenceiin diameter of the a tube 2 and the cage cylinder. The splash is caught in the chamber 8 andefiows back on the tube wall or, drips oil of the edge 7. with the: least tendencyto reach the stopple seat.

Obviously, however, this splash-guard effect can also beproduced' by other constructions I or configurations of the inner receptacle,

Whether the page is unit-ed direct to i the tube 2 of united thereto byn ean's of a junc- "tionpiece such as that shown and-all such I ledge formations will have theefiect of increasing, the creep-path: whether they contain the recntrant, closed top chamber, such as 8 or not- In its preferred "form the protectionof'the seat is obtained the ledge" formed by the chamber andrdrip edge, which parts serve both avsplash' guard and as a means oi lncreasmg'the creep-path.

fllVhe-n the cage structure ismade ofthinstock, it may if desired be suitably rein forced,at its extreme upper end, by hanging or beading. The port openings can be v punched in the sheet stock before it is rolled up to make the cage cylinder and suchports desirably extend below the top of the tube and thepart 6,-in order that-any liquid striking the seat inayj completely drain away froln it'and fall offthe drip edge. The simplicity of thecage structure will be obvione. I The vertical dimension otthe annular splash chamber 8 maybe increased with advantage because this increases the length of since if p the deposit 1 eventually reaches the seatfafter a long lapse of time, its formation thereon is so thin thatlfirm adhesion between the stopple and such anedge is practically impossible T i i I claim: foam-type fire-extinguisher, com- JI'lSlII an outer solution-containin rece b y c1 tacle, an inner "receptacle reinovablyi contained therein, the latter having a. stopple seat and a ledge formation projecting outwardly from the wall of the inner recepprovided with a downwardlydirected drip edge intervening between the solution level of the outer receptacle and the stopple seat.

3. A fire extinguisher comprising outer" and inner solut on-containing receptacles, the latter having .a' stopplle' seat and being provided with a downwardly directeddrip edge and an anularclosed top chainberboth intervening between thesol'uti'on level of the outerreceptaele and sa d seat.

- l 4, A fire extinguisher comprising outer and" inner solution-containing receptacles, the latter having a stopple seat and provided with a downwardly open, closed top annular chamber intervening between thesaine and the solution level in the outer receptacle;

5. A iire extinguishercontaining an inner receptac'le,comprising a tubular body having a stopple seat in combination withv a cage structure providing a, drip edge surroundngsaid tubular body andspaced therefrom.

I 6. A fire extinguisher containing an inner receptacle comprising a: tubular body, a

cage structure, and a separatelymade'junc- 1 tion. piece uniting said parts and constitut- 1nga stopple seat.

- 7 L A fire extinguisher containing an'inner receptacle having a cage structure of greater diameter v than itself and a I separately made annular unct1on'piece secur ngsaid strucv ture to t-liG, 1CPtL Ol9 1Il spaced relation thereto. I c I 8. extinguisher containing an inner receptacle comprising a tubular body, a cage of greater} diameter than said body and a junction piece securedcby' its middle Zone to said'body, the upper endQof said piece scrving'as a stopple seat and thelower end being secured to the lowerpartof said cage. 7 s

9. A'fire extinguishercontaining an inner recepta'cle comprising a tubular .body, a

sheet metal cage and zinintermediate, sep- ,arately made, sheet metal junction piece be- 7 the creep path."Thesplashguard and the extended 3 creep-path combine effectively 7 with the narrow or knife-edgestopple seat' tween said parts servingv as a stopple'seat.

'10. A fire extin uisher havin a main re- Y b D ceptacle containing an'finner receptacle, the

sheet metal cage of greaterdiz meter than'the tubular body occupying the neckcpeningcf saidnmin receptacle and an annular sheet 7 metal Wall connecting the lower endiof the.

tacle having a filling opening and cap, an

110 inner tubular receptacle laterally and Te? movably supported in said fillingopening and having. a stopple seat and alsoproiiiqled' A foam-t I e fire 'extin uisher c01ny v v vprising anouter solutionecontalning recep-- with a, r adially projecting leag'e above the solution levelin the outer container and be low sa d stopple seat, serving to IIICIBELSG the creep path.

- foam-type filfe extinguisher con-" taming an inner receptacle comprising a tubular body, a 'cage-tructure and junction pieceebetween them, the upper edge ofeaid 'ypiece forminga thin;.stoppleseat. v e I In-t'estiniony wherecfyl have signedthisf specification.

- YWILLIAM} W." WALKER; 1 

